Method for preparing high-strength titanium alloy parts by low-cost short process and application

Abstract

The present application belongs to the technical field of titanium alloy powder metallurgy, and relates to a method for preparing high-strength titanium alloy parts at low cost and in a short process and application thereof. The present application improves the tap and packing density of mixed powder by mixing spherical and non-spherical titanium alloy powder, so that densification is more thorough, which helps to eliminate or weaken the original particle boundary and reduce the adverse effects of impurities or oxides. Further, by controlling the O content of the spherical and non-spherical titanium alloy powder, the problem of mismatch between strength and plasticity can be avoided. By controlling the powder particle size range, the problem of multiple original particle boundaries of fine powder can be avoided, and the risk of low densification degree due to slow atom diffusion of coarse powder can be avoided. By adopting shaft pressing to obtain a green body before hot isostatic pressing, the initial green body density is improved, the shrinkage of the package during hot isostatic pressing is reduced, the difficulty of package design is reduced, which is conducive to the deformation control of the package and reduces the subsequent machining difficulty.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy powder metallurgy technology, specifically relating to a low-cost, short-process method for preparing high-strength titanium alloy parts and its application. Background Technology

[0002] Titanium alloys are widely used in aerospace, military, marine engineering, and biomedical fields due to their excellent properties such as low density, high strength, good corrosion resistance, and biocompatibility. Currently, traditional methods for producing titanium alloy parts include casting, forging, and powder metallurgy.

[0003] In particular, the slow cooling of the melt during the casting process of titanium alloy parts can lead to grain coarsening, thereby reducing the fatigue strength and toughness of the titanium alloy parts. Large-sized titanium alloy parts are prone to problems such as shrinkage cavities, porosity and inclusions in the core, which become fatal weaknesses of high-reliability components. In addition, the solidification process can also easily cause element segregation, affecting the homogeneity of the material.

[0004] The forging process of titanium alloy parts requires a press with a capacity of tens of thousands of tons due to the high deformation resistance of titanium alloys. The equipment investment and energy consumption are extremely high, and the cost of large and complex molds is also expensive. In addition, the multi-pass forging of forgings leads to the accumulation of allowances, and the material utilization rate is only 10-30%. Furthermore, insufficient deformation of the core of the forgings can easily lead to "dead zones", resulting in a greater gradient in the microstructure and properties.

[0005] Traditional powder metallurgy technology involves loading non-spherical titanium alloy powder into a rubber mold and mechanically pressing it in one or two directions to form a green compact with a certain density and strength. The green compact is then sintered in a protective atmosphere. The density of the green compact after traditional pressing is usually only 80-90% of the theoretical density. Even after sintering, the density only increases to 85-95%. Residual pores always exist inside the material, and these pores become stress concentration sources, significantly reducing the dynamic performance and reliability of the material.

[0006] Compared to traditional casting, forging, and powder metallurgy, hot isostatic pressing (HIP) technology involves packing pre-alloyed titanium powder into a casing, sealing it under vacuum, and holding it for a period of time under high temperature and extremely high isotropic pressure. This allows the powder particles to achieve densification through mechanisms such as plastic deformation, diffusion creep, and mass migration, ultimately obtaining a fully dense billet or near-net-shape part with a density close to the theoretical density. Titanium alloy parts produced by HIP technology have a density of up to 99%, uniform composition, no macroscopic component segregation in the microstructure, excellent comprehensive mechanical properties, and high material utilization. However, the following problems still exist: 1) Deformation during the hot isostatic pressing process of the cladding mold is difficult to control, resulting in a powder densification shrinkage rate exceeding 30%; 2) Cladling design is difficult, making shape control challenging; 3) Cladling molds need to be customized and require precision welding, heating for degassing, and helium leak detection, accounting for more than 30% of the manufacturing cost; 4) Titanium alloy parts prepared using hot isostatic pressing technology have low strength and require further processing to improve strength; 5) Titanium alloy parts must be hot isostatic pressed before heat treatment can be performed, extending the process cycle and increasing processing costs.

[0007] Therefore, there is an urgent need for a low-cost, short-process method to prepare high-strength titanium alloy parts, in order to solve the problem that the application of titanium alloys in the aerospace, medical, and automotive fields is limited by high costs and complex processes. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-cost, short-process method for preparing high-strength titanium alloy parts and its application.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] On the one hand, this invention provides a low-cost, short-process method for preparing high-strength titanium alloy parts, comprising the following steps:

[0011] Step 1: Mix the titanium alloy powders prepared by hydrogenation dehydrogenation method and plasma rotating electrode method respectively to obtain a mixed powder;

[0012] Step 2: Place the mixed powder into a mold and press it to obtain a green body;

[0013] Step 3: After the green blank is placed into the sleeve, it is degassed and sealed.

[0014] Step 4: Perform hot isostatic pressing on the sealed sleeve to obtain the blank;

[0015] Step 5: Remove the cladding from the blank by machining to obtain the desired titanium alloy part.

[0016] Specifically, in step 1, the titanium alloy powders prepared by the hydrogenation dehydrogenation method and the plasma rotating electrode method both have a particle size of 53-106 μm, an O content of 1200-1800 ppm, and a tap density of 2.1-3.0 g / cm³. 3 The particle size distributions of the titanium alloy powders prepared by the hydrogenation dehydrogenation method and the plasma rotating electrode method before mixing were D10=55±5μm, D50=72±5μm, and D90=102±5μm.

[0017] Specifically, in step 1, the mass ratio of the titanium alloy spherical powder prepared by the hydrogenation dehydrogenation method and the titanium alloy non-spherical powder prepared by the plasma rotating electrode method is 1:(1-5).

[0018] Specifically, in step 2, the mold is made of one of 20# steel, 304 steel, or 310S steel, and the pressing is done using axial unidirectional molding. The pressing parameters are: pressing force of 400-600MPa and pressing speed of 5-10mm / s.

[0019] Specifically, in step 2, the density of the green blank is 75-85%.

[0020] Specifically, in step 3, the material of the casing is 20# steel, and the parameters for degassing are: degassing temperature of 400-500℃ and heat preservation time of 6-10h.

[0021] Specifically, in step 3, after the sealing process, the internal vacuum degree of the casing is ≤10. -4 Pa.

[0022] Specifically, in step 4, the hot isostatic pressing process is as follows: first, the temperature is raised to 700-800℃ at a rate of 3-6℃ / min and held for 1-2 hours; then, the temperature and pressure are simultaneously increased at a rate of 2.5-3.5℃ / min to 900-980℃ and held at a pressure of 100-160MPa for 2-4 hours; then, the temperature is rapidly cooled to 480-650℃ at a rate of 50-80℃ / min and a pressure of 20-50MPa, and held for 4-6 hours; finally, the temperature is cooled to ≤200℃ in the furnace before being removed from the furnace.

[0023] Specifically, the prepared titanium alloy parts have a density ≥99.9%, a room temperature tensile strength ≥1050MPa, a yield strength ≥1000MPa, an elongation ≥9%, and a fatigue strength ≥600MPa.

[0024] On the other hand, the present invention provides a method for preparing high-strength titanium alloy parts using a low-cost, short-process method as described above, and the application of the titanium alloy parts prepared by this method in the aerospace, medical, and automotive fields.

[0025] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0026] 1) Mixing spherical titanium alloy powder with non-spherical titanium alloy powder in a certain mass ratio can significantly improve the tap density and packing density of the mixed powder, making densification more thorough, which helps to eliminate or weaken the original powder particle boundary (PPB), reduce the adverse effects of impurities or oxides on the PPB, and improve the strength of titanium alloy parts.

[0027] 2) By controlling the O content of spherical and non-spherical titanium alloy powders, the problem of mismatch between strength and plasticity can be effectively avoided; controlling the range of powder particle size can avoid the problem of many original particle boundaries (PPB) of fine powder, and also avoid the risk of low densification caused by slow atomic diffusion of coarse powder.

[0028] 3) Axial pressing is used to obtain a green billet with a density of 75-85% before hot isostatic pressing. By increasing the initial green billet density, the shrinkage of the cladding during hot isostatic pressing is reduced, which ultimately reduces the difficulty of cladding design, facilitates deformation control, and reduces the difficulty of subsequent machining. The density of the titanium alloy parts after hot isostatic pressing exceeds 99.9%.

[0029] 4) By adjusting the heating, pressurization, and cooling methods of hot isostatic pressing, the integration of hot isostatic pressing, solution treatment, and aging is achieved: the low-pressure heating process allows gases such as H2O, O2, and Cl2 adsorbed on the particle surface to fully volatilize and escape; the high-pressure heat preservation process causes the powder to undergo plastic flow and diffusion below the β phase region (α+β phase region), closing the pores; the low-temperature aging process causes secondary α phases to precipitate in the supersaturated α' or β phases. The secondary α phase forms a coherent interface with the matrix, hindering dislocation movement, effectively controlling the release of gases adsorbed on the powder particle surface, reducing the original particle boundary (PPB) that occurs during the titanium alloy production process, and improving the strength of titanium alloy parts;

[0030] 5) The process route of mixing spherical titanium alloy powder and non-spherical titanium alloy powder, followed by axial pressing, degassing, hot isostatic pressing, and machining, reduces the cost of raw materials (spherical titanium alloy powder is expensive), and eliminates the traditional powder loading and heat treatment processes, shortening the production cycle and effectively reducing production costs. Attached Figure Description

[0031] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a flowchart of the preparation method of the present invention;

[0034] Figure 2 This is a process curve diagram of the hot isostatic pressing process in Example 1;

[0035] Figure 3 Photographs of TC4 spherical powder and non-spherical mixed powder from Example 1;

[0036] Figure 4 The images show the microstructure of parts formed by hot isostatic pressing of TC4 spherical powder and non-spherical powder in Example 1.

[0037] Figure 5 The image shows the morphology of the hot isostatic pressing microstructure of TC4 spherical powder, a traditional powder metallurgy material, as a comparative example. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples consistent with some aspects of the invention as detailed in the appended claims.

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] This invention provides a low-cost, short-process method for preparing high-strength titanium alloy parts, comprising the following steps:

[0041] Step 1: Mix the titanium alloy powders prepared by hydrogenation dehydrogenation method and plasma rotating electrode method respectively to obtain a mixed powder;

[0042] Step 2: Place the mixed powder into a mold and press it to obtain a green body;

[0043] Step 3: After the green blank is placed into the sleeve, it is degassed and sealed.

[0044] Step 4: Perform hot isostatic pressing on the sealed sleeve to obtain the blank;

[0045] Step 5: Remove the cladding from the blank by machining to obtain the desired titanium alloy part.

[0046] Specifically, in step 1, the titanium alloy powders prepared by the hydrogenation dehydrogenation method and the plasma rotating electrode method both have a particle size of 53-106 μm, an O content of 1200-1800 ppm, and a tap density of 2.1-3.0 g / cm³. 3 The particle size distributions of the titanium alloy powders prepared by the hydrogenation dehydrogenation method and the plasma rotating electrode method before mixing were D10=55±5μm, D50=72±5μm, and D90=102±5μm.

[0047] Specifically, in step 1, the mass ratio of the titanium alloy spherical powder prepared by the hydrogenation dehydrogenation method and the titanium alloy non-spherical powder prepared by the plasma rotating electrode method is 1:(1-5).

[0048] Specifically, in step 2, the mold is made of one of 20# steel, 304 steel, or 310S steel, and the pressing is done using axial unidirectional molding. The pressing parameters are: pressing force of 400-600MPa and pressing speed of 5-10mm / s.

[0049] Specifically, in step 2, the density of the green blank is 75-85%.

[0050] Specifically, in step 3, the material of the casing is 20# steel, and the parameters for degassing are: degassing temperature of 400-500℃ and heat preservation time of 6-10h.

[0051] Specifically, in step 3, after the sealing process, the internal vacuum degree of the casing is ≤10. -4 Pa.

[0052] Specifically, in step 4, the hot isostatic pressing process is as follows: first, the temperature is raised to 700-800℃ at a rate of 3-6℃ / min and held for 1-2 hours; then, the temperature and pressure are simultaneously increased at a rate of 2.5-3.5℃ / min to 900-980℃ and held at a pressure of 100-160MPa for 2-4 hours; then, the temperature is rapidly cooled to 480-650℃ at a rate of 50-80℃ / min and a pressure of 20-50MPa, and held for 4-6 hours; finally, the temperature is cooled to ≤200℃ in the furnace before being removed from the furnace.

[0053] Specifically, the prepared titanium alloy parts have a density ≥99.9%, a room temperature tensile strength ≥1050MPa, a yield strength ≥1000MPa, an elongation ≥9%, and a fatigue strength ≥600MPa.

[0054] To demonstrate the effectiveness of the preparation method of the present invention, the following examples are provided for verification. Example 1

[0055] See Figure 1 , Figure 2As shown, this embodiment provides a low-cost, short-process method for preparing TC4 titanium alloy parts. The specific steps are as follows:

[0056] Step 1: Mix the TC4 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method uniformly to obtain a mixed powder. Before mixing, the particle size distribution of the TC4 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method are both D10=55±5μm, D50=72±5μm, and D90=102±5μm. The particle size of the TC4 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method is both 53-106μm. The O content of the non-spherical TC4 powder is 1740ppm, the O content of the spherical TC4 powder is 1300ppm, and the tap density of the non-spherical TC4 powder is 2.33g / cm³. 3 The tap density of TC4 spherical powder is 2.90 g / cm³. 3 ;

[0057] The mass ratio of TC4 spherical powder to TC4 non-spherical powder is 1:1; see the photograph of the mixed powder. Figure 3 As shown.

[0058] Step 2: Place the mixed powder into a 20# steel mold and press it to form a green body; the pressing is axial unidirectional molding, and the pressing parameters are: pressing force is 500MPa, pressing speed is 8mm / s, and the density of the green body after pressing is 81%.

[0059] Step 3: Place the green billet into a sleeve made of 20# steel, and perform degassing and sealing treatment on the sleeve; the parameters for degassing treatment are: degassing temperature 450℃, holding time 8h; after sealing the sleeve, the internal vacuum degree is 5×10 -5 Pa.

[0060] Step 4: The sealed sleeve is subjected to hot isostatic pressing (HIP) to obtain the billet. The HIP process is as follows: first, the temperature is increased to 750℃ at a rate of 3℃ / min and held for 1.5 hours; then, the temperature and pressure are simultaneously increased to 930℃ at a rate of 3℃ / min and held for 3 hours at a pressure of 130MPa; then, the temperature is rapidly cooled to 550℃ at a cooling rate of 50℃ / min and a pressure of 40MPa, and held for 4 hours; finally, the billet is cooled in the furnace to 200℃ and removed from the furnace. The titanium alloy billet obtained after HIP has a density of 99.99%. The microstructure of the billet is shown in the figure below. Figure 4 As shown.

[0061] Step 5: Remove the casing from the blank by machining to obtain the desired part. Example 2

[0062] This embodiment provides a low-cost, short-process method for preparing TC11 titanium alloy parts, the specific steps of which are as follows:

[0063] Step 1: Mix the TC11 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method respectively until homogeneous to obtain a mixed powder. Before mixing, the particle size distribution of the TC11 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method are D10=55±5μm, D50=72±5μm, and D90=102±5μm. The particle size of the TC11 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method are both 53-106μm. The O content of the non-spherical TC11 powder is 1723ppm, the O content of the spherical TC11 powder is 1250ppm, and the tap density of the non-spherical TC11 powder is 2.45g / cm³. 3 The tap density of TC11 spherical powder is 2.89 g / cm³. 3 ;

[0064] The mass ratio of the TC11 spherical powder to the TC11 non-spherical powder is 1:2.

[0065] Step 2: Place the mixed powder into a 304 steel mold and press it to form a green body; the pressing is axial unidirectional molding, and the pressing parameters are: pressing force is 600MPa, pressing speed is 10mm / s; the density of the green body obtained after pressing is 79%.

[0066] Step 3: Place the green billet into a sleeve made of 20# steel, and perform degassing and sealing treatment on the sleeve; the parameters for degassing treatment are: degassing temperature 500℃, holding time 10h; after sealing the sleeve, the internal vacuum degree is 3×10 -5 Pa.

[0067] Step 4: The sealed sleeve is subjected to hot isostatic pressing (HIP) to obtain the billet. The HIP process is as follows: first, the temperature is raised to 800°C at 6°C / min and held for 2 hours; then, the temperature and pressure are simultaneously increased to 950°C at 3.5°C / min and held for 4 hours at a pressure of 150 MPa; then, the temperature is rapidly cooled to 600°C at a cooling rate of 60°C / min and a pressure of 50 MPa, and held for 6 hours; finally, the billet is cooled to 150°C in the furnace and removed from the furnace. The density of the titanium alloy billet obtained after HIP is 99.98%.

[0068] Step 5: Remove the casing from the blank by machining to obtain the desired part. Example 3

[0069] This embodiment provides a low-cost, short-process method for preparing TA15 titanium alloy parts, the specific steps of which are as follows:

[0070] Step 1: Mix the TA15 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method uniformly to obtain a mixed powder. Before mixing, the particle size distribution of the TA15 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method are both D10=55±5μm, D50=72±5μm, and D90=102±5μm; the particle size of the TA15 powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method are both 53-106μm; the O content of the TA15 non-spherical powder is 1660ppm, the O content of the TA15 spherical powder is 1300ppm, and the tap density of the TA15 non-spherical powder is 2.56g / cm³. 3 The tap density of TA15 spherical powder is 2.95 g / cm³. 3 ;

[0071] The mass ratio of TA15 spherical powder to TA15 non-spherical powder is 1:3.

[0072] Step 2: The mixed powder is placed in a 310S steel mold and pressed to form a green body; the pressing is carried out by axial unidirectional molding, and the pressing parameters are: pressing force is 550MPa, pressing speed is 6mm / s; the density of the green body obtained after pressing is 76%.

[0073] Step 3: Place the green billet into a sleeve made of 20# steel, and perform degassing and sealing treatment on the sleeve; the parameters for degassing treatment are: degassing temperature 400℃, holding time 8h; after sealing the sleeve, the internal vacuum degree is 4.5×10 -5 Pa.

[0074] Step 4: The sealed sleeve is subjected to hot isostatic pressing (HIP) to obtain the billet. The HIP process is as follows: first, the temperature is increased to 700℃ at 5℃ / min and held for 1 hour; then, the temperature and pressure are increased simultaneously to 920℃ at 2.5℃ / min and held for 2 hours at a pressure of 120MPa; then, the temperature is rapidly cooled to 520℃ at a cooling rate of 80℃ / min and a pressure of 30MPa and held for 5 hours; finally, the billet is cooled to 100℃ in the furnace and removed from the furnace. The density of the titanium alloy billet obtained after HIP is 99.98%.

[0075] Step 5: Remove the casing from the blank by machining to obtain the desired part. Comparative Example 1

[0076] Step 1: TC4 spherical metal powder was prepared using the plasma rotating electrode method. The particle size distribution of the TC4 spherical metal powder was D10 = 55 ± 5 μm, D50 = 72 ± 5 μm, and D90 = 102 ± 5 μm. The prepared TC4 spherical metal powder had a particle size of 53-106 μm, an O content of 1300 ppm, and a tap density of 2.95 g / cm³. 3 .

[0077] Step 2: The TC4 spherical metal powder is loaded into a 20# steel sheath, and the sheath is degassed and sealed. The parameters for the degassed treatment are: degassed temperature 450℃, holding time 8 hours; after sealing, the internal vacuum degree is 5.2 × 10⁻⁶. -5 Pa.

[0078] Step 3: The sealed sleeve is subjected to hot isostatic pressing (HIP) to obtain a billet. The HIP process specifically involves simultaneous heating and pressurization, holding at 930℃ and 130MPa for 3 hours, followed by furnace cooling to 200℃ before removal from the furnace. The titanium alloy billet obtained by HIP has a density of 99.95%. The microstructure of the billet after HIP is shown in the image below. Figure 5 As shown.

[0079] Step 4: Roughly process the billet to remove the outer casing, and obtain a rough billet.

[0080] Step 5: Heat treat the rough billet to obtain a rough part; the parameters of the heat treatment are: solution temperature of 950℃, time of 1h, and air cooling; aging temperature of 550℃, time of 6h, and air cooling.

[0081] Step 6: Perform finishing on the heat-treated rough part to obtain the desired part.

[0082] To demonstrate the superiority of the titanium alloy parts prepared in the embodiments of the present invention, the forming performance, production cycle, and cost of the titanium alloy parts corresponding to Examples 1, 2, 3, and Comparative Example 1 are statistically analyzed. Specific data are shown in Table 1.

[0083] Table 1

[0084]

[0085] As can be seen from the data in Table 1, the preparation method of the present invention can significantly shorten the production cycle of titanium alloy parts and greatly reduce the production cost. The titanium alloy parts prepared by the preparation method of the present invention have a density of ≥99.98%, a room temperature tensile strength of ≥1050MPa, a yield strength of ≥1000MPa, an elongation of ≥9%, and a fatigue strength of ≥600MPa. This indicates that the strength and plasticity of the titanium alloy parts prepared by the preparation method of the present invention are improved to a certain extent compared with Comparative Example 1, which fully meets the application requirements in the aerospace, medical, and automotive fields.

[0086] Depend on Figure 4 , Figure 5It can be seen that complete densification was achieved in both the two different processing techniques used in Example 1 and the comparative example, and no visible pores appeared. The number of original particle boundaries (PPB) in the titanium alloy parts obtained by the method of the present invention was significantly reduced, which is beneficial to improving the comprehensive mechanical properties of the parts.

[0087] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0088] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A low-cost, short-process method for preparing high-strength titanium alloy parts, characterized in that, Includes the following steps: Step 1: Mix the titanium alloy powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method uniformly to obtain a mixed powder; the particle size of the titanium alloy powders prepared by the hydrogenation-dehydrogenation method and the plasma rotating electrode method is 53-106 μm, the O content is 1200-1800 ppm, and the tap density is 2.1-3.0 g / cm³. 3 ; Step 2: The mixed powder is placed in a mold and pressed to obtain a green body, the density of which is 75-85%. Step 3: After the green blank is placed into the sleeve, it is degassed and sealed. Step 4: Perform hot isostatic pressing on the sealed sleeve to obtain the blank; The hot isostatic pressing process is as follows: First, the temperature is raised to 700-800℃ at a rate of 3-6℃ / min and held for 1-2 hours. Then, the temperature and pressure are simultaneously increased at a rate of 2.5-3.5℃ / min to 900-980℃ and held at a pressure of 100-160MPa for 2-4 hours. Next, the temperature is rapidly cooled to 480-650℃ at a rate of 50-80℃ / min and a pressure of 20-50MPa, and held for 4-6 hours. Finally, the temperature is cooled to ≤200℃ in the furnace before being removed from the furnace. Step 5: Remove the cladding from the blank by machining to obtain the desired titanium alloy part.

2. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, In step 1, the particle size distribution of the titanium alloy powder prepared by the hydrogenation dehydrogenation method and the plasma rotating electrode method before mixing is D10=55±5μm, D50=72±5μm, and D90=102±5μm.

3. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, In step 1, the mass ratio of the titanium alloy powder prepared by the hydrogenation dehydrogenation method to the titanium alloy powder prepared by the plasma rotating electrode method is 1:(1-5).

4. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, In step 2, the mold is made of one of 20# steel, 304 steel, or 310S steel. The pressing is done using axial unidirectional molding, and the pressing parameters are: pressing force of 400-600MPa and pressing speed of 5-10mm / s.

5. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, In step 3, the material of the sheath is 20# steel, and the parameters for degassing are: degassing temperature of 400-500℃ and heat preservation time of 6-10h.

6. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, In step 3, after the sealing process, the internal vacuum degree of the casing is ≤10. -4 Pa.

7. The method for preparing high-strength titanium alloy parts in a low-cost, short-process manner according to claim 1, characterized in that, The prepared titanium alloy parts have a density ≥99.9%, a room temperature tensile strength ≥1050MPa, a yield strength ≥1000MPa, an elongation ≥9%, and a fatigue strength ≥600MPa.

8. The application of titanium alloy parts prepared by the low-cost, short-process method for preparing high-strength titanium alloy parts according to any one of claims 1-7, characterized in that, Applications in aerospace, medical, and automotive fields.

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